[  184.061953] ------------[ cut here ]------------
[  184.062035] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: unshare/336
[  184.062129] Modules linked in:
[  184.062196] CPU: 2 UID: 0 PID: 336 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  184.062289] Tainted: [W]=WARN
[  184.062343] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  184.062412] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  184.062476] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  184.062608] RSP: 0018:ff82f7ea8061fcc8 EFLAGS: 00010286
[  184.062672] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  184.062749] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fbbe00
[  184.062825] RBP: 0000000000000000 R08: ff3286d8431d0a90 R09: ff3286d842d2702c
[  184.062902] R10: ff3286d841c18118 R11: fefefefefefefeff R12: 0000000000000000
[  184.062978] R13: 0000000000000010 R14: ff3286d841c18000 R15: ff3286d842fbbe00
[  184.063058] FS:  00007f354b6d9740(0000) GS:ff3286d8cd796000(0000) knlGS:0000000000000000
[  184.063149] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  184.063219] CR2: 000055a6e93b0008 CR3: 00000000033aa006 CR4: 0000000000771ef0
[  184.063297] PKRU: 55555554
[  184.063344] Call Trace:
[  184.063393]  <TASK>
[  184.063442]  rtmsg_ifinfo+0x3c/0xa0
[  184.063499]  register_netdevice+0x889/0x9f0
[  184.063559]  register_netdev+0x1e/0x30
[  184.063616]  loopback_net_init+0x57/0xb0
[  184.063675]  ? vsock_sysctl_init_net+0xb6/0x140
[  184.063740]  ops_init+0x68/0x140
[  184.063798]  setup_net+0x85/0x150
[  184.063855]  copy_net_ns+0xf5/0x200
[  184.063912]  create_new_namespaces+0x117/0x2f0
[  184.063977]  unshare_nsproxy_namespaces+0x85/0xb0
[  184.064041]  ksys_unshare+0x346/0x5e0
[  184.064107]  __x64_sys_unshare+0x12/0x20
[  184.064168]  do_syscall_64+0x104/0xfc0
[  184.064228]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  184.064292] RIP: 0033:0x7f354b7d4bcb
[  184.064349] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
[  184.064480] RSP: 002b:00007fff64fc1858 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  184.064560] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f354b7d4bcb
[  184.064637] RDX: 0000000000000000 RSI: 00007fff64fc15c0 RDI: 0000000040000000
[  184.064713] RBP: 00007fff64fc1be0 R08: 00007fff64fc17b0 R09: 0000000000000000
[  184.064791] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  184.064867] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055a6caaa6b68
[  184.064945]  </TASK>
[  184.064993] ---[ end trace 0000000000000000 ]---
[  184.065716] ------------[ cut here ]------------
[  184.065779] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/336
[  184.065863] Modules linked in:
[  184.065919] CPU: 2 UID: 0 PID: 336 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  184.066013] Tainted: [W]=WARN
[  184.066068] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  184.066153] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  184.066217] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  184.066351] RSP: 0018:ff82f7ea8061fd68 EFLAGS: 00010286
[  184.066413] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  184.066489] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fbbe00
[  184.066568] RBP: 0000000000000000 R08: ff3286d8432e9cd0 R09: ff3286d8478c6030
[  184.066647] R10: ff3286d842e20118 R11: fefefefefefefeff R12: 0000000000000000
[  184.066723] R13: 0000000000000010 R14: ff3286d842e20000 R15: ff3286d842fbbe00
[  184.066803] FS:  000000003d524400(0000) GS:ff3286d8cd796000(0000) knlGS:0000000000000000
[  184.066882] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  184.066950] CR2: 00007ffadd498000 CR3: 000000000334c001 CR4: 0000000000771ef0
[  184.067028] PKRU: 55555554
[  184.067076] Call Trace:
[  184.067131]  <TASK>
[  184.067186]  rtmsg_ifinfo+0x3c/0xa0
[  184.067243]  register_netdevice+0x889/0x9f0
[  184.067300]  __tun_chr_ioctl+0x83c/0x16c0
[  184.067358]  ? do_sys_openat2+0x9a/0xe0
[  184.067417]  __x64_sys_ioctl+0xa1/0xe0
[  184.067474]  do_syscall_64+0x104/0xfc0
[  184.067531]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  184.067596] RIP: 0033:0x47cc8d
[  184.067653] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
[  184.067783] RSP: 002b:00007ffd66dfa850 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  184.067860] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  184.067935] RDX: 00007ffd66dfa8d0 RSI: 00000000400454ca RDI: 0000000000000005
[  184.068012] RBP: 00007ffd66dfa8a0 R08: 0000000000000000 R09: 0000000000000000
[  184.068088] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd66dfada8
[  184.068178] R13: 00007ffd66dfae28 R14: 0000000000000002 R15: 0000000000543540
[  184.068255]  </TASK>
[  184.068303] ---[ end trace 0000000000000000 ]---
[  184.068387] ------------[ cut here ]------------
[  184.068449] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/336
[  184.068534] Modules linked in:
[  184.068593] CPU: 2 UID: 0 PID: 336 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  184.068684] Tainted: [W]=WARN
[  184.068739] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  184.068807] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  184.068870] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  184.069003] RSP: 0018:ff82f7ea8061fd60 EFLAGS: 00010286
[  184.069065] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  184.069151] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fbbe00
[  184.069227] RBP: 0000000000000002 R08: ff3286d8432e9cd0 R09: ff3286d8478c6030
[  184.069303] R10: ff3286d842e20118 R11: fefefefefefefeff R12: 0000000000000000
[  184.069378] R13: 0000000000000010 R14: ff3286d842e20000 R15: ff3286d842fbbe00
[  184.069457] FS:  000000003d524400(0000) GS:ff3286d8cd796000(0000) knlGS:0000000000000000
[  184.069535] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  184.069605] CR2: 00007ffadd498000 CR3: 000000000334c001 CR4: 0000000000771ef0
[  184.069686] PKRU: 55555554
[  184.069734] Call Trace:
[  184.069782]  <TASK>
[  184.069830]  rtnetlink_event+0x6e/0xb0
[  184.069887]  notifier_call_chain+0x6d/0x100
[  184.069944]  netdev_update_features+0x56/0x60
[  184.070009]  __tun_chr_ioctl+0xbf1/0x16c0
[  184.070065]  ? file_init_path+0x62/0x120
[  184.070128]  __x64_sys_ioctl+0xa1/0xe0
[  184.070192]  do_syscall_64+0x104/0xfc0
[  184.070249]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  184.070312] RIP: 0033:0x47cc8d
[  184.070368] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
[  184.070498] RSP: 002b:00007ffd66dfa890 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  184.070579] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  184.070657] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  184.070733] RBP: 00007ffd66dfa8e0 R08: 0000000000000000 R09: 0000000000000000
[  184.070809] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd66dfada8
[  184.070885] R13: 00007ffd66dfae28 R14: 0000000000000002 R15: 0000000000543540
[  184.070961]  </TASK>
[  184.071009] ---[ end trace 0000000000000000 ]---
[  184.071092] ------------[ cut here ]------------
[  184.071164] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/336
[  184.071250] Modules linked in:
[  184.071306] CPU: 2 UID: 0 PID: 336 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  184.071398] Tainted: [W]=WARN
[  184.071453] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  184.071522] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  184.071588] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  184.071719] RSP: 0018:ff82f7ea8061fc10 EFLAGS: 00010286
[  184.071782] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  184.071858] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fbbe00
[  184.071934] RBP: 0000000000000000 R08: ff3286d8432e9cd0 R09: ff3286d844d5b030
[  184.072011] R10: ff3286d842e20118 R11: fefefefefefefeff R12: 0000000000000000
[  184.072090] R13: 0000000000000010 R14: ff3286d842e20000 R15: ff3286d842fbbe00
[  184.072187] FS:  000000003d524400(0000) GS:ff3286d8cd796000(0000) knlGS:0000000000000000
[  184.072270] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  184.072340] CR2: 00007ffadd498000 CR3: 000000000334c001 CR4: 0000000000771ef0
[  184.072424] PKRU: 55555554
[  184.072474] Call Trace:
[  184.072523]  <TASK>
[  184.072576]  rtmsg_ifinfo+0x3c/0xa0
[  184.072639]  __dev_notify_flags+0xb1/0xf0
[  184.072700]  netif_change_flags+0x54/0x70
[  184.072762]  dev_change_flags+0x45/0x80
[  184.072821]  devinet_ioctl+0x607/0x7f0
[  184.072882]  inet_ioctl+0x229/0x240
[  184.072944]  ? __rtnl_unlock+0x35/0x60
[  184.073006]  sock_do_ioctl+0x75/0x140
[  184.073070]  __x64_sys_ioctl+0xa1/0xe0
[  184.073142]  do_syscall_64+0x104/0xfc0
[  184.073203]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  184.073271] RIP: 0033:0x47cc8d
[  184.073331] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
[  184.073468] RSP: 002b:00007ffd66dfa870 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  184.073551] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  184.073632] RDX: 00007ffd66dfa8e0 RSI: 0000000000008914 RDI: 0000000000000006
[  184.073713] RBP: 00007ffd66dfa8c0 R08: 0000000000000000 R09: 0000000000000000
[  184.073796] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd66dfada8
[  184.073879] R13: 00007ffd66dfae28 R14: 0000000000000002 R15: 0000000000543540
[  184.073957]  </TASK>
[  184.074006] ---[ end trace 0000000000000000 ]---
[  229.046454] ------------[ cut here ]------------
[  229.046565] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/336
[  229.046663] Modules linked in:
[  229.046734] CPU: 2 UID: 0 PID: 336 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.046837] Tainted: [W]=WARN
[  229.046893] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.046964] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.047029] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  229.047334] RSP: 0018:ff82f7ea8061fb58 EFLAGS: 00010286
[  229.047425] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  229.047509] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fd4a00
[  229.047593] RBP: 0000000000000000 R08: ff3286d8432e9cd0 R09: ff3286d844d5b030
[  229.047670] R10: ff3286d842e20118 R11: fefefefefefefeff R12: 0000000000000000
[  229.047746] R13: 0000000000000010 R14: ff3286d842e20000 R15: ff3286d842fd4a00
[  229.047827] FS:  0000000000000000(0000) GS:ff3286d8cd796000(0000) knlGS:0000000000000000
[  229.047924] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.048003] CR2: 00007ffadd498000 CR3: 0000000030e42002 CR4: 0000000000771ef0
[  229.048082] PKRU: 55555554
[  229.048134] Call Trace:
[  229.048184]  <TASK>
[  229.048235]  rtmsg_ifinfo+0x3c/0xa0
[  229.048299]  netif_close_many+0xed/0x190
[  229.048357]  unregister_netdevice_many_notify+0x267/0x9d0
[  229.048421]  ? __queue_work+0x141/0x550
[  229.048480]  unregister_netdevice_queue+0x9e/0xd0
[  229.048544]  __tun_detach+0x591/0x5b0
[  229.048605]  tun_chr_close+0x3f/0xc0
[  229.048664]  __fput+0xe8/0x2c0
[  229.048724]  task_work_run+0x63/0xa0
[  229.048781]  do_exit+0x2c1/0xba0
[  229.048839]  ? netlink_dump+0x336/0x450
[  229.048898]  do_group_exit+0x2d/0xc0
[  229.048954]  get_signal+0x82e/0x900
[  229.049012]  arch_do_signal_or_restart+0x77/0x2b0
[  229.049079]  exit_to_user_mode_loop+0x75/0x4a0
[  229.049147]  do_syscall_64+0x439/0xfc0
[  229.049206]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.049276] RIP: 0033:0x4c2d9e
[  229.049334] Code: Unable to access opcode bytes at 0x4c2d74.
[  229.049403] RSP: 002b:00007ffd66dfa200 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[  229.049480] RAX: 0000000000000050 RBX: 00007ffd66dfa290 RCX: 00000000004c2d9e
[  229.049558] RDX: 0000000000000000 RSI: 00007ffd66dfa2a0 RDI: 0000000000000007
[  229.049635] RBP: 00007ffd66dfa210 R08: 0000000000000000 R09: 0000000000000000
[  229.049714] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd66dfa284
[  229.049790] R13: 00007ffd66dfae28 R14: 00007ffd66dfa3d0 R15: 0000000000543540
[  229.049867]  </TASK>
[  229.049915] ---[ end trace 0000000000000000 ]---
[  229.050054] ------------[ cut here ]------------
[  229.050123] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/336
[  229.050209] Modules linked in:
[  229.050274] CPU: 2 UID: 0 PID: 336 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.050372] Tainted: [W]=WARN
[  229.050427] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.050496] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.050561] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  229.050726] RSP: 0018:ff82f7ea8061fbc8 EFLAGS: 00010286
[  229.050812] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  229.050930] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fd4a00
[  229.051029] RBP: 0000000000000000 R08: ff3286d8432e9cd0 R09: ff3286d847802030
[  229.051138] R10: ff3286d842e20118 R11: fefefefefefefeff R12: 0000000000000000
[  229.051260] R13: 0000000000000011 R14: ff3286d842e20000 R15: ff3286d842fd4a00
[  229.051395] FS:  0000000000000000(0000) GS:ff3286d8cd796000(0000) knlGS:0000000000000000
[  229.051511] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.051614] CR2: 00007ffadd498000 CR3: 0000000030e42002 CR4: 0000000000771ef0
[  229.051740] PKRU: 55555554
[  229.051797] Call Trace:
[  229.051868]  <TASK>
[  229.051932]  unregister_netdevice_many_notify+0x877/0x9d0
[  229.052009]  unregister_netdevice_queue+0x9e/0xd0
[  229.052085]  __tun_detach+0x591/0x5b0
[  229.052326]  tun_chr_close+0x3f/0xc0
[  229.052386]  __fput+0xe8/0x2c0
[  229.052444]  task_work_run+0x63/0xa0
[  229.052501]  do_exit+0x2c1/0xba0
[  229.052560]  ? netlink_dump+0x336/0x450
[  229.052618]  do_group_exit+0x2d/0xc0
[  229.052675]  get_signal+0x82e/0x900
[  229.052732]  arch_do_signal_or_restart+0x77/0x2b0
[  229.052798]  exit_to_user_mode_loop+0x75/0x4a0
[  229.052863]  do_syscall_64+0x439/0xfc0
[  229.052921]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.052986] RIP: 0033:0x4c2d9e
[  229.053042] Code: Unable to access opcode bytes at 0x4c2d74.
[  229.053118] RSP: 002b:00007ffd66dfa200 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[  229.053196] RAX: 0000000000000050 RBX: 00007ffd66dfa290 RCX: 00000000004c2d9e
[  229.053279] RDX: 0000000000000000 RSI: 00007ffd66dfa2a0 RDI: 0000000000000007
[  229.053356] RBP: 00007ffd66dfa210 R08: 0000000000000000 R09: 0000000000000000
[  229.053432] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd66dfa284
[  229.053507] R13: 00007ffd66dfae28 R14: 00007ffd66dfa3d0 R15: 0000000000543540
[  229.053586]  </TASK>
[  229.053634] ---[ end trace 0000000000000000 ]---
[  229.063227] ------------[ cut here ]------------
[  229.063272] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#1: kworker/u16:0/12
[  229.063337] Modules linked in:
[  229.063363] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.063424] Tainted: [W]=WARN
[  229.063449] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.063483] Workqueue: netns cleanup_net
[  229.063508] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.063539] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  229.063640] RSP: 0018:ff82f7ea80067c78 EFLAGS: 00010286
[  229.063671] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  229.063713] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fd4b00
[  229.063756] RBP: 0000000000000000 R08: ff3286d8431d0a90 R09: ff3286d8479b982c
[  229.063798] R10: ff3286d841c18118 R11: fefefefefefefeff R12: 0000000000000000
[  229.063840] R13: 0000000000000011 R14: ff3286d841c18000 R15: ff3286d842fd4b00
[  229.063883] FS:  0000000000000000(0000) GS:ff3286d8cd716000(0000) knlGS:0000000000000000
[  229.063929] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.063959] CR2: 00007f909911f770 CR3: 0000000002eb2001 CR4: 0000000000771ef0
[  229.064001] PKRU: 55555554
[  229.064016] Call Trace:
[  229.064032]  <TASK>
[  229.064048]  unregister_netdevice_many_notify+0x877/0x9d0
[  229.064079]  default_device_exit_batch+0x318/0x390
[  229.064114]  ops_undo_list+0x10b/0x240
[  229.064136]  cleanup_net+0x1d7/0x2e0
[  229.064164]  process_one_work+0x162/0x360
[  229.064189]  worker_thread+0x16e/0x2d0
[  229.064212]  ? rescuer_thread+0x510/0x510
[  229.064235]  kthread+0xe1/0x120
[  229.064264]  ? kthread_park+0xa0/0xa0
[  229.064289]  ret_from_fork+0x16d/0x250
[  229.064310]  ? kthread_park+0xa0/0xa0
[  229.064332]  ret_from_fork_asm+0x11/0x20
[  229.064358]  </TASK>
[  229.064371] ---[ end trace 0000000000000000 ]---